Introduction

PyCharm makes it possible to work with islands of different languages embedded in the source code.
You can inject other languages into string literals. This can be done within the source code written in most (but not all) of the
supported languages. The typical examples are HTML fragments injected into JavaScript code, SQL statements in XML, and so on.

When the editor recognizes a string as a language injection:

Syntax and error highlighting and coding assistance are extended to this string.

You can open and modify it in a separate tab in the editor,
as if you were working with the source code in the corresponding language.

To open an injection in the editor, use the Edit <Language> Fragmentintention action.

Prerequisites

Before you start working with language injections, make sure that the IntelliLang plugin is enabled.
The plugin is bundled with PyCharm and is activated by default. If it is not, enable the plugin as described in
Enabling and Disabling Plugins.

Injecting a language into the source code and cancelling language injection

To tell PyCharm that certain text should be treated as an embedded source code fragment, you can use:

The Inject Language/Referenceintention action,
which is applied to a particular string:

After that, you have to select the desired language from the menu.

Note that if you use this method, it’s possible that the string literal will stay marked
as a language injection only within a limited period of time. That is, PyCharm, at a
certain moment, may "forget" that the corresponding literal is a language injection. The
period of the injection "persistence" will depend on the language, context and the
modifications that you make in other parts of your source code.

The Language Injections page of the Settings dialog.
By creating new language injection configurations on that page, you can specify that a certain
method parameter, text in an XML tag, or XML attribute should always be treated as an embedded source code
fragment in another language.

PyCharm comes with a set of predefined injection configurations which is quite sufficient to ensure
high productivity and comfortable environment. Therefore it is strongly recommended that you use the
predefined injection configurations and avoid creating new ones.

Moving injections between the IDE and the project levels

User-defined injections are assigned either to the IDE or the project level.
The IDE-level injections are available in all of your projects.
The project-level injections can be used only in the project in which they are defined.